Answer:
Helium
In the sun, hydrogen is converted to __<u>Helium</u>__ through nuclear fusion.
Diffusion is the movement of a substance from an area of high concentration to an area of low concentration . Diffusion happens in liquids and gases because their particles move randomly from place to place . Diffusion is an important process for living things ; it is how substances move in and out of cells .
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Answer:
customary Is the required system
